On-board power source device

1. An on-board power source device for a vehicle, the on-board power device comprising:

power storage modules stacked one upon another in a predetermined direction, in which a plurality of power storage elements extending in the predetermined direction are arranged side by side in a plane orthogonal to the predetermined direction, the power storage module having a discharge path for discharging gas generated in the power storage elements to the outside of the power storage module through a discharge valve provided at an end side of the power storage elements in the predetermined direction, and an outlet of the discharge path provided at an end portion of the power storage module in an arrangement direction of the plurality of power storage elements;

a frame member that extends along the end portion of upper and lower power storage modules at which the respective outlets are arranged and that fixes the upper and lower power storage modules, the frame member having a hollow interior formed as a discharge space for discharging the gas outside of the vehicle; and

a bracket located at the end portion so as to cover the outlets, the bracket fixing the upper power storage module to the frame member, the bracket including a passage part for communicating the outlet of the upper power storage module with the discharge space of the frame member.

2. The on-board power source device according to claim 1 , wherein:

the upper and lower power storage modules stacked one upon the other are fixed to the frame member via the bracket;

the passage part extends from the outlet of the upper power storage module downwardly towards the frame member via the outlet of the lower power storage module, and includes a first communication portion communicating with the outlet of the upper power storage module and a second communication portion communicating with the outlet of the lower power storage module; and

an end of the passage part that is lower than the second communication portion is connected to a communication hole of the discharge space formed in the frame member.

3. The on-board power source device according to claim 1 , wherein:

one end of the passage part is connected to the outlet of the upper power storage module, and the other end of the passage part is connected to a first communication hole of the discharge space formed in a top face of the frame member that is below the upper power storage module; and

the lower power storage module is fixed to the frame member with the outlet being located at a side face of the frame member that extends downwardly from the top face, and the outlet is directly connected to a second communication hole of the discharge space formed in the side face.

4. The on-board power storage device according to claim 1 , wherein, in the on-board power source device, a plurality of power storage module units each having the power storage modules stacked one upon another are adjacently arranged in a direction in which the frame member extends, the bracket is provided for the adjacent power storage module units, and the bracket is provided with a plurality of said passage parts corresponding to the respective power storage module units.

5. The on-board power storage device according to claim 1 , wherein the power storage modules each have:

a holder having a plurality of opening portions respectively for insertion of the plurality of power storage elements and holding an end side of the respective power storage elements;

a first bus bar that is formed with a plurality of first connection portions corresponding to the respective power storage elements arranged in the plane, each of the first connection portions being connected to a first end, which constructs one of end electrodes of the power storage elements at an end side of the power storage elements inserted into the holder and which is provided with the discharge valve, and protruding from a plate shaped base portion extending in the plane towards the first end;

a second bus bar that is formed with a plurality of second connection portions corresponding to the respective power storage elements arranged in the plane, each of the second connection portions being connected to a second end, which constructs another end of the electrodes of the power storage elements at the other end side of the power storage elements; and

a cover member for covering the first end of the respective power storage elements arranged in the plane via the first bus bar to form the discharge path for the gas.

6. The on-board power storage device according to claim 2 , wherein, in the on-board power source device, a plurality of power storage module units each having the power storage modules stacked one upon another are adjacently arranged in a direction in which the frame member extends, the bracket is provided for the adjacent power storage module units, and the bracket is provided with a plurality of said passage parts corresponding to the respective power storage module units.

7. The on-board power storage device according to claim 3 , wherein, in the on-board power source device, a plurality of power storage module units each having the power storage modules stacked one upon another are adjacently arranged in a direction in which the frame member extends, the bracket is provided for the adjacent power storage module units, and the bracket is provided with a plurality of said passage parts corresponding to the respective power storage module units.

8. The on-board power storage device according to claim 6 , wherein the power storage modules each have:

a holder having a plurality of opening portions respectively for insertion of the plurality of power storage elements and holding an end side of the respective power storage elements;

a first bus bar that is formed with a plurality of first connection portions corresponding to the respective power storage elements arranged in the plane, each of the first connection portions being connected to a first end, which constructs one end of electrodes of the power storage elements at an end side of the power storage elements inserted into the holder and which is provided with the discharge valve, and protruding from a plate shaped base portion extending in the plane towards the first end;

a second bus bar that is formed with a plurality of second connection portions corresponding to the respective power storage elements arranged in the plane, each of the second connection portions being connected to a second end, which constructs an other end of the electrodes of the power storage elements at the other end side of the power storage elements; and

a cover member for covering the first end of the respective power storage elements arranged in the plane via the first bus bar to form the discharge path for the gas.

9. The on-board power storage device according to claim 7 , wherein the power storage modules each have:

a holder that has a plurality of opening portions respectively for insertion of the plurality of power storage elements and that holds an end side of the respective power storage elements;

a first bus bar that is formed with a plurality of first connection portions corresponding to the respective power storage elements arranged in the plane, each of the first connection portions being connected to a first end, which constructs one end of electrodes of the power storage elements at an end side of the power storage elements inserted into the holder and which is provided with the discharge valve, and protruding from a plate shaped base portion extending in the plane towards the first end;

a second bus bar that is formed with a plurality of second connection portions corresponding to the respective power storage elements arranged in the plane, each of the second connection portions being connected to a second end, which constructs an other end of the electrodes of the power storage elements at the other end side of the power storage elements; and

a cover member for covering the first end of the respective power storage elements arranged in the plane via the first bus bar to form the discharge path for the gas.